644544114463 has 8 divisors (see below), whose sum is σ = 654169373136. Its totient is φ = 634940366400.

The previous prime is 644544114439. The next prime is 644544114469. The reversal of 644544114463 is 364411445446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-644544114463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644544114469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5317273 + ... + 5437138.

It is an arithmetic number, because the mean of its divisors is an integer number (81771171642).

Almost surely, 2^644544114463 is an apocalyptic number.

644544114463 is a deficient number, since it is larger than the sum of its proper divisors (9625258673).

644544114463 is a wasteful number, since it uses less digits than its factorization.

644544114463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10755305.

The product of its digits is 2211840, while the sum is 46.

The spelling of 644544114463 in words is "six hundred forty-four billion, five hundred forty-four million, one hundred fourteen thousand, four hundred sixty-three".